By definition, a nerve is
a. a bundle of sensory, motor, or both types of
nerve fibers outside the central nervous
system.
b. a single extension of a neuron.
c. the same as a neuron but within the central
nervous system.
d. a collection of nerve cell bodies outside the
central nervous system.
e. a fiber more than ten inches in length.
A
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Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species. Recently, these birds have been classified as eastern and western forms of a single species, the yellow-rumped warbler
Which of the following pieces of evidence, if true, would be cause for this reclassification? A) The two forms interbreed often in nature, and their offspring have good survival and reproduction. B) The two forms live in similar habitats. C) The two forms have many genes in common. D) The two forms have similar food requirements. E) The two forms are very similar in coloration.
At the yeast mating-type locus, the mating-type switch is initiated by introducing a double-strand break at the MAT locus. What would happen if the double-strand break were introduced at the HML? locus instead?
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As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?
A. There is no treatment for ulcers, then or now. B. Antibiotics are now used to treat ulcers. C. Different foods are now suggested for patients having ulcers. D. Doctors now give their patients sedatives to calm patients with ulcers.
To signal a stronger stimulus, action potentials within a neuron?
A. Get bigger B. Travel more quickly C. Last Longer D. Are generated More frequently